Having the same problem! Would not charge the battery from charger, or from USB. When I plug into computer Blackberry Desktop will not recognize the Playbook. On the 25th it worked fine, on the 26th stopped working. I am on OS 2.1 as per the last upgrade. I tried a 'system wipe' but with only 11% left on the battery I do not have enough power to rebuild the system (needs a min. of 20%). If I am unable to get this thing charged I will have an expensive paper weight.
Please help if possible!!!